For what it's worth, Watcher said on Twitter yesterday that the Dark Shaman set has a shared drop lockout across Normal/Heroic and Flex where you have only one chance a week. Whoever said that you get multiple chances was mistaken, so no more need to do flex pugs for people that clear normal/heroic every week.

I have killed the boss every week since 5.4 went live and still haven't seen it.

For what it's worth, Watcher said on Twitter yesterday that the Dark Shaman set has a shared drop lockout across Normal/Heroic and Flex where you have only one chance a week. Whoever said that you get multiple chances was mistaken, so no more need to do flex pugs for people that clear normal/heroic every week.

I have killed the boss every week since 5.4 went live and still haven't seen it.

They don't share a lockout I ran flex earlier this week nothing than did normal where I received the set

Yesterday I did Flex pt2, nothing. Later on the evening we did our normal run with my guild and *BOOM*, got it!
So there are 2 chances per week to get it, flex and normal/hc does NOT share. The best part about the set though is the fact I can taunt the 2 other shamans in my raid about it > <3